Hey all! Ok, here's my story. I'm building a gaming computer. I've installed all the hardware/components and the thing boots up, but I get a DOS message that says "Error Loading OS". Basically what I did is purchased a new ASUS barebones with an Intel Core 2 Duo cpu, 500w power supply and 2gb of memory. I then transferred my old hard drive, cd-rom and floppy drive to the new case. My old pc was a PIII 600mhz Gateway circa 2000, so I knew I would be having problems upon bootup...lol Anywho, I have an authentic Windows XP Home version disk which, according to the books that came with it, can be used as an upgrade disk or a new install. The problem is when I insert the XP disk, it tells me I need a full version and to insert another disk. I have an ME disk (without mthe key code unfortunately) which allows me to get past the "full version" message. I then insert my XP disk, it goes through the entire setup process (like it's actually gonna work), then when the pc reboots itself, the next message I keep getting is "Error Loading OS". PLEASE HELP!!!!! What am i doing wrong? Is there a backdoor I can use? Settings to change?